Pregnant due to pre-ovulatory fluid?

Hi,

I'm wondering how likely it is to get pregnant from pre-cum? You read so many different things online. And I know there's always a chance.

But anyway:
My boyfriend and I always use condoms, but sometimes right before the 'foreplay' starts, he comes in for like 5 seconds. Doesn't seem like the chance is that big then, right?
It was around my fertile period though, and that night I woke up with pain, like a sharp stab in my uterus.
Other than that, no 'weird' symptoms up to today.

And maybe someone who has experienced something like this too?
Thanks in advance! Kisses